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WikiPedia: Mặt_Mobius http://www.google.com/patents?vid=3267406 http://www.google.com/patents?vid=512340 http://www.livescience.com/strangenews/080507-math... http://www.nature.com/nmat/journal/v6/n8/abs/nmat1... http://www.math.wichita.edu/~pparker/research/sog.... //pubmed.ncbi.nlm.nih.gov/16825563 //pubmed.ncbi.nlm.nih.gov/17632519 http://www.ams.org/mathmedia/archive/10-2006-media... //arxiv.org/abs/cond-mat/0308019 //arxiv.org/abs/cond-mat/0309636